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dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:45106 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kej77-0006TF-3E for qemu-devel@archiver.kernel.org; Mon, 16 Nov 2020 13:20:29 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:34084) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kej2M-0000P2-Pp for qemu-devel@nongnu.org; Mon, 16 Nov 2020 13:15:34 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:55533) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kej2L-00012g-08 for qemu-devel@nongnu.org; Mon, 16 Nov 2020 13:15:34 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605550532; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=86xeRISBElX6LZh7Ud5xSXELkhDu63Yaetysf8HUjm8=; b=B/ErAiAC51h+3JcuvKYXQZFjTw59RhvnEv+D/0qJLjrUdH2twsETxiIzpz3LWvDnhDSZju BCCPRaDRMZ2tOv/+iMrz7G5VSJVyI+NxtajIxuGTFSdCTT12zpiDpO9SMHvC6+BTK5467K SJ/XOxaLwFh4HQAhG/yLXLJLayqi6wk= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-365-jJohAIVFOMSQPp7JHi4mKA-1; Mon, 16 Nov 2020 13:15:28 -0500 X-MC-Unique: jJohAIVFOMSQPp7JHi4mKA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 56F1F1882FA1; Mon, 16 Nov 2020 18:15:26 +0000 (UTC) Received: from laptop.redhat.com (ovpn-113-230.ams2.redhat.com [10.36.113.230]) by smtp.corp.redhat.com (Postfix) with ESMTP id DEBE95C1CF; Mon, 16 Nov 2020 18:15:22 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, alex.williamson@redhat.com Subject: [RFC v7 09/26] vfio: Force nested if iommu requires it Date: Mon, 16 Nov 2020 19:13:32 +0100 Message-Id: <20201116181349.11908-10-eric.auger@redhat.com> In-Reply-To: <20201116181349.11908-1-eric.auger@redhat.com> References: <20201116181349.11908-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eric.auger@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=216.205.24.124; envelope-from=eric.auger@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/15 22:35:17 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, jacob.jun.pan@linux.intel.com, jean-philippe@linaro.org, tn@semihalf.com, shameerali.kolothum.thodi@huawei.com, nicoleotsuka@gmail.com, vivek.gautam@arm.com, yi.l.liu@intel.com, peterx@redhat.com, zhangfei.gao@gmail.com, yuzenghui@huawei.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" In case we detect the address space is translated by a virtual IOMMU which requires HW nested paging to integrate with VFIO, let's set up the container with the VFIO_TYPE1_NESTING_IOMMU iommu_type. Signed-off-by: Eric Auger --- v4 -> v5: - fail immediatly if nested is wanted but not supported v2 -> v3: - add "nested only is selected if requested by @force_nested" comment in this patch --- hw/vfio/common.c | 36 ++++++++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 8 deletions(-) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index c1fdbf17f2..80c68c0446 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -1543,27 +1543,38 @@ static void vfio_put_address_space(VFIOAddressSpace *space) * vfio_get_iommu_type - selects the richest iommu_type (v2 first) */ static int vfio_get_iommu_type(VFIOContainer *container, + bool want_nested, Error **errp) { - int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, + int iommu_types[] = { VFIO_TYPE1_NESTING_IOMMU, + VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU }; - int i; + int i, ret = -EINVAL; for (i = 0; i < ARRAY_SIZE(iommu_types); i++) { if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) { - return iommu_types[i]; + if (iommu_types[i] == VFIO_TYPE1_NESTING_IOMMU && !want_nested) { + continue; + } + ret = iommu_types[i]; + break; } } - error_setg(errp, "No available IOMMU models"); - return -EINVAL; + if (ret < 0) { + error_setg(errp, "No available IOMMU models"); + } else if (want_nested && ret != VFIO_TYPE1_NESTING_IOMMU) { + error_setg(errp, "Nested mode requested but not supported"); + ret = -EINVAL; + } + return ret; } static int vfio_init_container(VFIOContainer *container, int group_fd, - Error **errp) + bool want_nested, Error **errp) { int iommu_type, ret; - iommu_type = vfio_get_iommu_type(container, errp); + iommu_type = vfio_get_iommu_type(container, want_nested, errp); if (iommu_type < 0) { return iommu_type; } @@ -1668,6 +1679,14 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, VFIOContainer *container; int ret, fd; VFIOAddressSpace *space; + IOMMUMemoryRegion *iommu_mr; + bool nested = false; + + if (as != &address_space_memory && memory_region_is_iommu(as->root)) { + iommu_mr = IOMMU_MEMORY_REGION(as->root); + memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_VFIO_NESTED, + (void *)&nested); + } space = vfio_get_address_space(as); @@ -1735,12 +1754,13 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, QLIST_INIT(&container->giommu_list); QLIST_INIT(&container->hostwin_list); - ret = vfio_init_container(container, group->fd, errp); + ret = vfio_init_container(container, group->fd, nested, errp); if (ret) { goto free_container_exit; } switch (container->iommu_type) { + case VFIO_TYPE1_NESTING_IOMMU: case VFIO_TYPE1v2_IOMMU: case VFIO_TYPE1_IOMMU: { -- 2.21.3